參數(shù)資料
型號(hào)： bq2050H
廠商： Benchmark Technology Group
英文描述： Low-Cost Lithium Ion Power Gauge IC(低價(jià)格鋰離子電源氣體Gauge芯片)
中文描述： 低成本鋰離子動(dòng)力計(jì)IC（低價(jià)格鋰離子電源氣體計(jì)芯片）
文件頁(yè)數(shù)： 2/24頁(yè)
文件大?。?/td> 213K
代理商： BQ2050H
Pin Descriptions
LCOM
LEDcommonoutput
This open-drain output switches V
CC
to
source current for the LEDs. The switch is
off during initialization to allow reading of
the soft pull-up or pull-down program resis-
tors. LCOM is also high impedance when the
display is off.
SEG
1
–
SEG
5
LED display segment outputs (dual func-
tion with PROG
1
–PROG
5
)
Each output may activate an LED to sink
the current sourced from LCOM.
PROG
1
–
PROG
2
Programmed full count selection inputs
(dual function with SEG
1
–SEG
2
)
These three-level input pins define the pro-
grammed full count (PFC) thresholds de-
scribed in Table 2.
PROG
3
–
PROG
4
Power gauge scale selection inputs (dual
function with SEG
3
–SEG
4
)
These three-level input pins define the scale
factor described in Table 2.
PROG
5
Self-discharge rate selection (dual func-
tion with SEG
5
)
This three-level input pin defines
self-discharge and battery compensation fac-
tors as shown in Table 1.
the
CFC
Charge FET control output
This pin can be used as an additional control
to the charge FET of the Li-Ion pack protec-
tion circuitry.
V
SS
Ground
SR
Sense resistor input
The voltage drop (V
SR
) across the sense re-
sistor R
S
is monitored and integrated over
time to interpret charge and discharge activ-
ity. The SR input is tied between the nega-
tive terminal of the battery and the sense re-
sistor. V
SR
< V
SS
indicates discharge, and
V
SR
> V
SS
indicates charge.
voltage drop, V
SRO
, as seen by the bq2050H
is V
SR
+ V
OS
.
The effective
DISP
Display control input
DISP high disables the LED display. DISP
tied to V
CC
allows PROG
X
to connect di-
rectly to V
CC
or V
SS
instead of through a
pull-up or pull-down resistor. DISP floating
allows the LED display to be active during
charge. DISP low activates the display. See
Table 1.
SB
Secondary battery input
This input monitors the battery cell voltage
potential through a high-impedance resis-
tive divider network for end-of-discharge
voltage (EDV) thresholds and battery-removed
detection.
RBI
Register backup input
This pin is used to provide backup potential to
the bq2050H registers during periods when
V
CC
≤
3V. A storage capacitor or a battery
can be connected to RBI.
HDQ
Serial communication input/output
This is the open-drain bidirectional commu-
nications port.
PSTAT
Protector status input
This input provides overvoltage status from
the Li-Ion protector circuit.
nect to V
SS
when not used.
It should con-
REF
Voltage reference output for regulator
REF provides a voltage reference output for
an optional micro-regulator.
V
CC
Supply voltage input
2
bq2050H
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